You need a curved backdrop in the corner - in front of the pipes.
1) Remove the backdrop from the wall and remove the buildings just behind the track.
2) Get large, tall piece(s) of white oaktag.
3) Bend the oaktag to the outside curve of the track ties.
4) Secure oaktag at the bottom and perhaps to the pipe, leaving clearance between the oaktag and the curved track. You may need some reinforcement behind the oaktag.
5) Mount the backdrop on the curved surface of the oaktag.
MELGAR
